nano my_comment.md
cargo run -- submit-comment  --post-hash $POST_HASH --content-path my_comment.md  --author @yuandj
cat comment_template.txt
cat blockchain.json | jq '.pending_transactions'
cargo run -- mine --miner d9b32afc14a94948dec6600727f70e8fc7a36529cb81f005566fe82fe2810036
